JP2020511592A - 方向性電磁鋼板用焼鈍分離剤組成物、方向性電磁鋼板および方向性電磁鋼板の製造方法 - Google Patents
方向性電磁鋼板用焼鈍分離剤組成物、方向性電磁鋼板および方向性電磁鋼板の製造方法 Download PDFInfo
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Abstract
Description
セラミック粉末を1〜10重量部さらに含んでもよい。
セラミック粉末は、Al2O3、SiO2、TiO2、およびZrO2の中から選択される1種以上であってもよい。
溶媒を50〜500重量部さらに含んでもよい。
前記被膜は、Alを0.1〜40重量%、Mgを40〜85重量%、Siを0.1〜40重量%、Oを10〜55重量%、およびFeを残部として含んでもよい。
被膜は、厚さが0.1〜10μmであってもよい。
前記酸化層は、酸化アルミニウムを含むことができる。
鋼板の厚さ方向への断面に対して、前記酸化層の面積に対する酸化アルミニウムの占有面積は0.1〜50%であってもよい。
本発明の一実施形態において、追加の成分をさらに含むとの意味は、追加成分の追加量だけ残部を代替して含むことを意味する。
[反応式1]
2Mg(OH)2+SiO2→Mg2SiO4+2H2O
△T=2次再結晶焼鈍温度と常温温度との差(℃)、
αSi−Fe=素材の熱膨張係数、
αC=一次被膜の熱膨張係数、
Ec=一次被膜の弾性(Young’s Modulus)の平均値
δ=素材とコーティング層との厚さ比、
νRD=圧延方向におけるポアソン比(Poisson’s ratio)
を示す。
次に、鋼スラブを加熱する。この時、スラブの加熱は、1,200℃以下で低温スラブ法で加熱することができる。
次に、熱延板を冷間圧延して、冷延板を製造する。冷延板を製造する段階は、冷間圧延を1回実施するか、中間焼鈍を含む2回以上の冷間圧延を実施することができる。
次に、1次再結晶焼鈍された鋼板の表面上に、焼鈍分離剤を塗布する。焼鈍分離剤については具体的に前述したので、繰り返しの説明は省略する。
重量%で、Si:3.2%、C:0.055%、Mn:0.12%、Al:0.026%、N:0.0042%、S:0.0045%を含み、Sn:0.04%、Sb:0.03%、P:0.03%、および残部としてFeおよび不可避不純物からなる鋼スラブを製造した。
υRD:圧延方向におけるPoisson’s ratio
T:コーティング前の厚さ
t:コーティング後の厚さ
I:試験片の長さ
H:曲率半径
図2B、2C、2D、2Eは、それぞれ図2Aにおける2、3、6、7位置の分析結果である。
11 酸化層
20 被膜
100 方向性電磁鋼板
次に、鋼スラブを加熱する。この時、スラブの加熱は、1,200℃以下で低温スラブ法で加熱することができる。
Claims (16)
- 酸化マグネシウムおよび水酸化マグネシウムのうちの1種以上を100重量部、および
水酸化アルミニウムを5乃至200重量部を含む、ことを特徴とする方向性電磁鋼板用焼鈍分離剤組成物。 - 前記水酸化アルミニウムは、平均粒度が5乃至100μmである、ことを特徴とする請求項1に記載の方向性電磁鋼板用焼鈍分離剤組成物。
- セラミック粉末を1乃至10重量部さらに含む、ことを特徴とする請求項1に記載の方向性電磁鋼板用焼鈍分離剤組成物。
- 前記セラミック粉末は、Al2O3、SiO2、TiO2、およびZrO2の中から選択される1種以上である、ことを特徴とする請求項3に記載の方向性電磁鋼板用焼鈍分離剤組成物。
- 溶媒を50乃至500重量部さらに含む、ことを特徴とする請求項1に記載の方向性電磁鋼板用焼鈍分離剤組成物。
- 方向性電磁鋼板基材の一面または両面にAl−Si−Mg複合物を含む被膜が形成された、ことを特徴とする方向性電磁鋼板。
- 前記被膜は、Alを0.1乃至40重量%、Mgを40乃至85重量%、Siを0.1乃至40重量%、Oを10乃至55重量%、およびFeを残部として含む、ことを特徴とする請求項6に記載の方向性電磁鋼板。
- 前記被膜は、Mg−Si複合物、Al−Mg複合物、またはAl−Si複合物をさらに含む、ことを特徴とする請求項6に記載の方向性電磁鋼板。
- 前記被膜は、厚さが0.1乃至10μmである、ことを特徴とする請求項6に記載の方向性電磁鋼板。
- 前記被膜および前記基材の界面から前記基材の内部に酸化層が形成された、ことを特徴とする請求項6に記載の方向性電磁鋼板。
- 前記酸化層は、酸化アルミニウムを含む、ことを特徴とする請求項10に記載の方向性電磁鋼板。
- 鋼板の厚さ方向への断面に対して、前記酸化アルミニウムの平均粒径は5乃至100μmである、ことを特徴とする請求項11に記載の方向性電磁鋼板。
- 鋼板の厚さ方向への断面に対して、前記酸化層の面積に対する前記酸化アルミニウムの占有面積は0.1乃至50%である、ことを特徴とする請求項11に記載の方向性電磁鋼板。
- 前記方向性電磁鋼板基材は、シリコン(Si):2.0乃至7.0重量%、アルミニウム(Al):0.020乃至0.040重量%、マンガン(Mn):0.01乃至0.20重量%、リン(P)0.01乃至0.15重量%、炭素(C)0.01重量%以下(0%を除く)、N:0.005乃至0.05重量%、およびアンチモン(Sb)、スズ(Sn)、またはこれらの組合せを0.01乃至0.15重量%含み、残部はFeおよびその他の不可避不純物からなる、ことを特徴とする請求項6に記載の方向性電磁鋼板。
- 鋼スラブを準備する段階と、
前記鋼スラブを加熱する段階と、
前記加熱された鋼スラブを熱間圧延して、熱延板を製造する段階と、
前記熱延板を冷間圧延して、冷延板を製造する段階と、
前記冷延板を1次再結晶焼鈍する段階と、
前記1次再結晶焼鈍された鋼板の表面上に、焼鈍分離剤を塗布する段階と、
前記焼鈍分離剤が塗布された鋼板を2次再結晶焼鈍する段階とを含み、
前記焼鈍分離剤は、酸化マグネシウムおよび水酸化マグネシウムのうちの1種以上を100重量部、および水酸化アルミニウムを5乃至200重量部含む、ことを特徴とする方向性電磁鋼板の製造方法。 - 前記冷延板を1次再結晶焼鈍する段階は、
前記冷延板を同時に脱炭焼鈍および窒化焼鈍する段階、または脱炭焼鈍後、窒化焼鈍する段階を含む、ことを特徴とする請求項15に記載の方向性電磁鋼板の製造方法。
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